本文關(guān)鍵詞：伺服控制器加速退化試驗(yàn)方法研究　出處：《浙江理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 伺服控制器 加速壽命試驗(yàn) 加速退化試驗(yàn) 可靠性評估 可靠性試驗(yàn)

【摘要】：伺服控制器是數(shù)控設(shè)備控制系統(tǒng)的核心單元,一旦發(fā)生故障,必將導(dǎo)致數(shù)控設(shè)備故障、停機(jī)。與世界制造強(qiáng)國相比,國產(chǎn)伺服控制器在可靠性水平方面存在較大差距,中高檔伺服控制器主要依賴于進(jìn)口,自給率不足10%。為增強(qiáng)國產(chǎn)伺服控制器的市場競爭力,提升自主創(chuàng)新能力,亟需建立伺服控制器可靠性測評試驗(yàn)方法。通過快速測評伺服控制器的可靠性,可以在短期內(nèi)獲知其可靠性水平、暴露潛在設(shè)計(jì)缺陷和薄弱環(huán)節(jié),并依此改進(jìn)設(shè)計(jì),提升國產(chǎn)伺服控制器可靠性水平。本文通過對伺服控制器加速退化試驗(yàn)方法的研究,提出一種加速退化試驗(yàn)方法,實(shí)現(xiàn)對伺服控制器可靠性的快速測評。本文主要研究內(nèi)容與結(jié)論如下:第一章,概述了論文的研究背景、目的和意義;綜述了加速退化試驗(yàn)及試驗(yàn)統(tǒng)計(jì)分析方法方面的國內(nèi)外研究現(xiàn)狀和發(fā)展趨勢,以及系統(tǒng)級產(chǎn)品加速退化試驗(yàn)與試驗(yàn)數(shù)據(jù)統(tǒng)計(jì)分析方面存在的問題;結(jié)合研究目標(biāo)提出了本文的研究內(nèi)容。第二章,分析確定了伺服控制器組成和工作原理;通過調(diào)研與試驗(yàn)分析,確定了導(dǎo)致伺服控制器無脈沖信號輸出、顯示屏無顯示、濾波電容失效、按鍵失靈等故障發(fā)生的主要應(yīng)力因素為高溫環(huán)境和電應(yīng)力;通過環(huán)境模擬試驗(yàn),確定了環(huán)境應(yīng)力和工作應(yīng)力對伺服控制器工作性能的影響程度,以及輸出脈沖電壓變化可以表征產(chǎn)品性能變化;通過加速試驗(yàn),發(fā)現(xiàn)了不同溫度應(yīng)力水平下輸出脈沖電壓變化量可被用作特征參量描述伺服控制器性能退化過程,以及輸出脈沖電壓隨溫度應(yīng)力與試驗(yàn)時(shí)間的變化規(guī)律;為設(shè)計(jì)伺服控制器加速退化試驗(yàn)奠定了基礎(chǔ)。第三章,依據(jù)伺服控制器輸出脈沖電壓隨溫度應(yīng)力與試驗(yàn)時(shí)間的變化規(guī)律,提出了一種可以在進(jìn)行恒定應(yīng)力加速退化試驗(yàn)期間測量不同溫度應(yīng)力水平下輸出脈沖電壓差值的溫度應(yīng)力施加方式;利用條件廣義協(xié)方差極小法,經(jīng)過對加速試驗(yàn)數(shù)據(jù)的統(tǒng)計(jì)論分析,提出了溫度應(yīng)力水平的選取準(zhǔn)則,建立了加速退化試驗(yàn)應(yīng)力施加剖面,保障了伺服控制器加速退化試驗(yàn)的成功實(shí)施。第四章,開展了加速退化試驗(yàn),通過分析確定了利用冪函數(shù)退化模型可以描述不同溫度應(yīng)力水平下輸出脈沖電壓變化量的變化過程,并依此計(jì)算出了伺服控制器的偽失效壽命;綜合利用圖分析法、擬合優(yōu)度檢驗(yàn)和相關(guān)性檢驗(yàn)方法,確定了伺服控制器的壽命服從對數(shù)正態(tài)分布;在此基礎(chǔ)上,基于Arrenius加速模型計(jì)算出了伺服控制器在工作溫度應(yīng)力下的可靠壽命;試驗(yàn)分析結(jié)果表明,利用本文提出的加速退化試驗(yàn)方法能夠?qū)崿F(xiàn)對伺服控制器可靠性的快速測評。第五章,總結(jié)了本文的研究內(nèi)容,并對進(jìn)一步的研究工作進(jìn)行了展望。
[Abstract]:Servo controller is the core unit of NC equipment control system. Once it breaks down, it will lead to the failure and shutdown of NC equipment, compared with the world manufacturing power. There is a big gap in the reliability level of the domestic servo controller. The medium and high grade servo controller mainly depends on the import and the self-sufficiency rate is less than 10% in order to enhance the market competitiveness of the domestic servo controller. In order to improve the capability of independent innovation, it is urgent to establish the reliability test method of servo controller. The reliability level of servo controller can be obtained in a short period of time by quickly evaluating the reliability of servo controller. Expose the potential design defects and weak links, and improve the design according to this, improve the reliability level of domestic servo controller. This paper studies the accelerated degradation test method of servo controller. An accelerated degradation test method is proposed to evaluate the reliability of servo controller. The main contents and conclusions of this paper are as follows: the first chapter summarizes the research background, purpose and significance of the paper; The research status and development trend of accelerated degradation test and test statistical analysis methods at home and abroad, and the problems existing in the statistical analysis of system grade product accelerated degradation test and test data are summarized. In the second chapter, the composition and working principle of servo controller are analyzed and determined. Through investigation and experimental analysis, it is determined that the main stress factors that cause the servo controller to have no pulse signal output, display screen without display, filter capacitor failure, key failure and so on are high temperature environment and electric stress. The influence of environmental stress and working stress on the performance of servo controller is determined by environmental simulation test, and the change of output pulse voltage can be used to characterize the performance of the servo controller. Through the accelerated test, it is found that the output pulse voltage variation can be used as a characteristic parameter to describe the performance degradation process of the servo controller at different temperature stress levels. And the variation of output pulse voltage with temperature stress and test time; It lays a foundation for the design of servo controller accelerated degradation test. Chapter 3, according to the servo controller output pulse voltage with temperature stress and test time variation rule. In this paper, a new method of applying thermal stress is proposed, which can measure the difference of output pulse voltage at different temperature stress levels during the accelerated degradation test of constant stress. By using the conditional generalized covariance minimization method and the statistical analysis of the accelerated test data, the criterion of selecting the temperature stress level is put forward, and the stress applied profile of the accelerated degradation test is established. It ensures the successful implementation of the servo controller accelerated degradation test. Chapter 4th, the accelerated degradation test is carried out. The power function degradation model is used to describe the variation process of output pulse voltage under different temperature stress levels, and the pseudo-failure life of servo controller is calculated. The logarithmic normal distribution of the service life of the servo controller is determined by using the graph analysis method, the goodness of fit test and the correlation test method. On this basis, the reliable life of the servo controller under the working temperature stress is calculated based on the Arrenius acceleration model. The experimental results show that the accelerated degradation test method proposed in this paper can be used to quickly evaluate the reliability of servo controller. Chapter 5th summarizes the research contents of this paper. The further research work is prospected.
【學(xué)位授予單位】：浙江理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP273

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